Homemade low pass

[LuNaTiC 10+ year member]

Is there a way to make a homemade low pass filter?

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[duginnz 10+ year member]

yeh there is, but its not the sort of shit that i recommend to people who know more than the basics, and ime guessin that if you need two car parks you wont be able to pull this off. do a few hours overtime and buy wot u need, it will be a hell of a lot easier.

 

[paikiah 5,000+ posts]

I tried to build my own (would've made a decent one) but I couldn't locate an LCR meter to determine how much coil to cut off and stuff.

 

[maylar 10+ year member]

A 2 element lowpass will give you 12 dB/Octave. You need an inductor in series with the speaker and a capacitor in parallel with it. You calculate the values like this:

Inductance = Impedance / (2 * Pi * freq)

That will be Henries. Multiply by 1000 to get milliHenries, which is what the parts vendors will list them as.

Capacitance = 1 / (2 * Pi * freq * Impedance)

That will be in Farads. Multiply by 1 million to get microFarads.

The problem is that inductors add resistance because of their wire. And they get big. Ones will handle high power should be at least 18 gage.

Partsexpress.com sells the components.

 

[LuNaTiC 10+ year member]

Your a ****ing math genius I'd rather buy one then read that again. //content.invisioncic.com/y282845/emoticons/confused.gif.e820e0216602db4765798ac39d28caa9.gif

 

[paikiah 5,000+ posts]

No, he's an EE with buckets of experience. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif I tend to trust Maylar the most when it comes to electronics/electric. I suggest you do the same...//content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif